OK, basically it's the basis of TR's foreign policy. He believes that white Americans are the most virile race, which is why they can conquer other nations like the Phillipines, and that they should do so, because failing to do so is womanish. He expresses a particular distaste for the Chinese, and says that American women should do their part by having lots of babies, so that America has more soldiers.

It's pretty much a racist diatribe, and a summation of his beliefs.